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Porous organic polymers (POPs) have great potential in air and water pollutant treatments. However, the cost-effective syntheis of novel POPs remains a challenge. In this work, we fabricated a new porous organic polymer with P-N linkage (PCPD) via a low-cost catalyst-free polycondensation between 3,3′-diaminobenzidine and hexachlorocyclotriphosphazene under solvothermal conditions. The chemical composition, microstructure and thermal property were characterized by FT-IR, SEM, TEM NMR, DSC, TGA and N 2 sorption. The adsorption performance of PCPD was also studied. The results revealed that PCPD owns good microporosity, N-rich skeleton as well as abundant amino/imine groups. Tested for CO 2 adsorption at 273 K/1 bar and 298 K/1 bar, PCPD exhibited superior CO 2 uptakes of 127.6 mg g−1 and 83.6 mg g−1, respectively. Moreover, the isosteric heats of adsorption at low adsorption values was up to 33.3 kJ mol−1. PCPD also delivered a superior removal performance towards toxic Cr (VI) from aqueous solution with equilibrium adsorption capacity of 205 mg g−1 and instantaneous adsorption capacity of 148 mg g−1 within 5 min at pH= 2. The Cr (VI) adsorption process is spontaneous and exothermic and well obeys intraparticle diffusion model, pseudo-second order kinetics, and Langmuir isotherm model. The plausible removal mechanism included electrostatic interaction, hydrogen bonding interaction, pore filling and the concurrent Cr (VI) reduction followed by in situ chelation on polymer adsorbent. PCPD would open a new field for efficient treatment of air and water pollutants due to its fascinating structure feature and excellent adsorption performance. [Display omitted] • A novel porous organic polymer adsorbent with P-N linkage was designed facilely. • The adsorbent has a specific surface area of up to 366.8 m2 g−1. • High CO 2 capture capacities at atmospheric pressure: 127.6 mg g−1 at 273 K. • Remarkably adsorption capacity towards toxic Cr (VI): 205 mg g−1 at 298 K. • Removal mechanism: electrostatic, H-bond interaction, and reduction-chelation. [ABSTRACT FROM AUTHOR]

We proposed a feasible strategy to prepare a rigid-flexible coupled polyphosphazene supported polyurethane foam (PUF-PCP) adsorbent by in situ polycondensation between hexachlorocyclotriphosphazene and polyethyleneimine on the surface of polyurethane foam (PUF) at room temperature. Owing to combination of the open cell porous structure of PUF support and the superior adsorption capacity of PCP coatings, the PUF-PCP composite adsorbent exhibited good adsorption behavior towards anionic dyes. Especially, the experimental adsorption capacity of PUF-PCP for methyl orange (MO) dye was up to 978.56 mg g−1 at 25 ºC. The relative separation factors of MO for methylene blue, crystal violet and rhodamine B were 224.1, 78.1 and 161.8 respectively, exhibiting an excellent adsorption selectivity of PUF-PCP towards MO. Moreover, the used PUF-PCP adsorbent can be easily collected and regenerated. The adsorption test data were best explained by Langmuir model and pseudo-second-order model. The adsorption process of MO onto PUF-PCP was spontaneous and endothermic. XPS and FT-IR analysis confirmed that electrostatic adsorption and hydrogen bonding were the plausible uptake mechanism of PUF-PCP for MO molecules. The present work demonstrated that PUF-PCP has promising potential in removing environmental anionic pollutants from waterbody. [Display omitted] • PUF-PCP was facilely fabricated by in situ polycondensation at room temperature. • The maximum adsorption capacity of PUF-PCP for MO was up to 978.56 mg g−1. • PUF-PCP can selectively adsorb anionic dyes from binary mixed dye system. • The relative separation factor of anionic MO for cationic MB was as high as 224.1. • PUF-PCP absorbent exhibited good reusability for MO removal. [ABSTRACT FROM AUTHOR]